Treadle.



J. L. L. MoGOR MAGK.

TREADLE.

APPLICATION FILED 001'. 2. 1911.

1,1 15,558; Patented Nov. 3, 1914.

r: tn

WIT-155555: InveY-IIEI" qm mme J 5 L. L. Mu'curmack THE NORRIS PETERS 50.. FHO7U-LITHO-, WASHINGTON, D C

chain.

u TED STATES PATENT orrion.

JAMES L. L. MQCORMACK, or CHICAGO, ILLINOIS, ASSIGNOR TO HARIJI'NGE 1230s., or

CHICAGO, ILLINOIS, A CORPORATION or LLINoIs.

Specification of Ltt'ers la'tent. Application filed October 2, 911.

Serial No. 652,417.

To aZZ whom it may concern: I

Be it known that I, JAMES L. L. McCon- MACK, a citizen of the .United States, residing at Chicago, in the county ofjCookand State of Illinois, have invented a certain new and useful Improvement in Treadles,

of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming the. treadle is moved to its operating position it is retained in such position without the use of catches or auxiliary looks. The treadle proper is so formed that by pressing upon a second portion of it, the treadle and belt shifter are returned to their inoperative position.

The several drawings illustrating my in vention are as follows: shows my improved treadle in Figure 1 side view, and in this figure there is also shown diagrammatically a belt shifting mechanism and connections extending from the belt shifter to the treadle mechanism.

Fig. 2 is a top view of the treadle mechanism shown in Fig. l. Similar numerals refer to similar throughout the several views.

As shown in the drawings, the treadle mechanism consists of a base 1, to which there is pivoted upon a suitable rod or shaft 2, a foot treadle 3. The major portion of the treadle projects from the pivoting rod 2 over the base 1., and is pivotally connected by means of a bracket it projecting down ward from theunder side of the treadle with a link 5, the other end of which is pivotally connected with the upper left-hand end of the bell-crank 6, pivotally mounted. upon parts the base 1 by means of a rod 7. The lower y right hand end of the bell-crank 6 is connected by a cord or chain 8 with one end of a belt shifter 9, a guiding sheave 10 being employed to properly direct the cord or The belt shifter 9 is sh'dably mounted in lines, as the result Patented Nov. 3, 1914. I

supports 11, and has connected to it a spring v 12 which moves the shifter to its left-hand position when such motion mechanism. I The belt shifter 9 is provided with two pins 13 and 14, which engage the opposite edges, as a result of which when the shifter is moved from one" belt 15 upon position to the other, the belt is moved from one to the other of two pulleys 16 and 17 carried by the shaft 18. The pulley 16 is loosely mounted on the shaft 18, and is held in place by a collar 19, while the pulley 17 is rigidly keyed on to the shaft as indicated at 20. The shaft 18 shownin the drawing is assumed to be a shaft which itiis desired means of the belt 15, power he.

to drive by ing communicated to the belt from a suitable source not shown.

The belt shifter 9is normally caused to occupy its left hand position by means of v the spring 12, which keeps thetreadle 3 in t is permitted by the disposition of the parts of the treadle its upper position, indicated by the dotted of which the belt 15 normallyengages the loosepulley 16 and thus does not operate the shaft 18. When it is desired to drive the shaft18,the treadle 3 is depressed, which through the cooperation of the link 5' and bell-crank 6, rotates the bell-crank around to the right upon its support, thus moving the belt shifter 9 to the right against the action to move the belt ,15 from the pulley 16 to the pulley 17. The parts of the treadle mechanism are so proportioned that when.

of the spring 12,

the treadle 3 is depressed to the position indicated in Fig. 1,

its righthand end strikes the upper end of the bell-crank 6 which serves as a stop to preventfurther motion of the treadle.

For this positionof the parts the thrust exerted upon the link 5 by the bell-crank 6 due to the tension of the spring 12, is exerted in a line practically through pivotal support 2 of the treadle 3, and thus there is no tendency for the thrust exerted to raise the treadle. When it is desired to stopthe shaft 18, the treadle 3 is raised by pressing upon the portion 21 extending to the left of the pivot 2. As soon as the right hand end of the treadle is raised sufficiently so that the line of the thrust exerted upon the treadle by the link 5 is above the pivot 2, the tension of the spring 12 serves to lift the treadle to its ppermost position, indicated in dotted practically lines, upon the loose pulley 16. Motion of the parts of the treadle beyond the position indicated in dotted lines, is prevented by a flange 22 formed on the rear edge of the bracket 4, which engages the link 5 when the treadle 3 is in its raised position. The flange 22 is so disposed upon the bracket 4: that when the treadle mechanism is in the position indicated in dotted lines, the line of thrust exerted upon the bell-crank 6 by pressing upon the treadle 3 will be su'fiiciently above the pivot 7 of the bell-crank, so that the bell -crank may be rotated without diiiiculty by such pressure.

YVhile I have shown my invention in the particular embodiment herein described, I

do not, however, limit myself to this exact construction, but may employ any mechanical equivalent for carrying out my invention.

IVhat I claim is:

1. In a treadle mechanism the combination of a base, a treadle pivoted to the base, a bell-crank pivoted to the base, and a link connecting the'treadle with one end of the bell-crank so that when the treadle is in one of its positions the axis of the link extends through the pivot of the treadle. 2. In a treadle mechanism the combination of abase, a treadle pivoted to the base, a bell-crank pivotedto the base, and a link connecting the treadle with one end of the bell-crank so that when the treadle is in one of its positions the of the link extends practically through the pivot of the treadle, and when the treadle is in its other position, said axis extends outside of the pivot of the bell-crank.

3 In a treadle mechanism the combination of a base, a treadle pivoted to the base, a bell-crank pivoted to the base, and a link connecting the treadle with one end of the bell-crank so that when the treadle is in one of its positions the axis of the link extends practically through the pivot of the treadle, and a projection secured to the treadle and Copies of this patent may be obtained for for which position the belt 15 rests connecting the treadle and the other the bell crank lever, sald mechanism being extending from the treadle pivot in a direction opposite to that in which the treadle extends.

l. In a treadle mechanism the combination of a base, a treadle pivoted to the base, a bell-crank pivoted to the base, and a link connecting the treadle with one end of the bell-crank so that when the treadle is in one of its positions the axis of the link extends practically through the pivot of the treadle, and when the treadle i'sin its other position, said axis extends outside of the pivot 01. the bell crank, and a projection secured to the treadle and extending from the treadle pivot in a direction opposite to that in which the treadle extends 5. In a treadle mechanism, he combination of a base, a treadle, a bell crank lever pivoted to the base, a member connected with one arm or" the bell crank lever exerting thereon at all times a force tending to turn it upon its pivot, and mechanism for arm of so disposed relatively to the bell crank lever and treadle that the force communicated to said mechanism through the bell crank lever from said member retains the treadle in ac tuated position when operated.

6. In a treadle mechanism, the combination of a base, a treadle, a lever pivoted to the base, a member connected with the lever exerting thereon at all times a force tending to turn it upon its pivot, and mechanism for connecting the treadle and lever, said mechanism being so disposed relatively to the lever and treadle that the force communicated to said mechanism through the lever from said member retalns the treadle in actuated position when operated. V

In Witness whereof, I hereunto subscribe my name this 26th day of September, 1911.

' JAMES L. L. MoCOR-MACK. \Vitnesses:

AL E TO. BELL, v AiiBIN C. Antenna.

five cents each, by addressing the Commissioner of Eatents, Washington, D. G. 

